EP2474724A1 - Steuervorrichtung für einen turbolader - Google Patents

Steuervorrichtung für einen turbolader Download PDF

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Publication number
EP2474724A1
EP2474724A1 EP10846812A EP10846812A EP2474724A1 EP 2474724 A1 EP2474724 A1 EP 2474724A1 EP 10846812 A EP10846812 A EP 10846812A EP 10846812 A EP10846812 A EP 10846812A EP 2474724 A1 EP2474724 A1 EP 2474724A1
Authority
EP
European Patent Office
Prior art keywords
engine
nozzle vane
control
vane mechanism
vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10846812A
Other languages
English (en)
French (fr)
Other versions
EP2474724A4 (de
EP2474724B1 (de
Inventor
Yasuhiro Azuma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
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Toyota Motor Corp
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Filing date
Publication date
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Publication of EP2474724A1 publication Critical patent/EP2474724A1/de
Publication of EP2474724A4 publication Critical patent/EP2474724A4/de
Application granted granted Critical
Publication of EP2474724B1 publication Critical patent/EP2474724B1/de
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Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/44—Series-parallel type
    • B60K6/445—Differential gearing distribution type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
    • F01D17/143—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path the shiftable member being a wall, or part thereof of a radial diffuser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F01D17/165—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes for radial flow, i.e. the vanes turning around axes which are essentially parallel to the rotor centre line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/24—Control of the pumps by using pumps or turbines with adjustable guide vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
    • F02C6/04—Gas-turbine plants providing heated or pressurised working fluid for other apparatus, e.g. without mechanical power output
    • F02C6/10—Gas-turbine plants providing heated or pressurised working fluid for other apparatus, e.g. without mechanical power output supplying working fluid to a user, e.g. a chemical process, which returns working fluid to a turbine of the plant
    • F02C6/12—Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/40—Application in turbochargers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

Definitions

  • the present invention relates to a control device of a turbocharger mounted to a hybrid vehicle or the like, and more specifically to a control device of a variable nozzle vane turbocharger.
  • turbochargers Engines (internal combustion engines) in vehicles are often equipped with turbochargers (superchargers) that utilize the exhaust energy.
  • turbochargers include a turbine wheel that is rotated by the exhaust gas flowing through an exhaust path of the engine, a compressor impeller that forces the air in the intake path into combustion chambers of the engine, and a coupling shaft that couples the turbine wheel and the compressor impeller.
  • a turbocharger having such a structure when the exhaust gas blows against the turbine wheel and rotates the turbine wheel, then this rotation is transmitted via the coupling shaft to the compressor impeller.
  • the air in the intake path is forced into the combustion chambers by the rotation of the compressor impeller.
  • variable nozzle vane turbochargers are known, in which the turbine wheel side is provided with a variable capacity.
  • the variable nozzle vane turbochargers include a variable nozzle vane mechanism (VN mechanism) and an actuator (motor-type actuator).
  • the variable nozzle vane mechanism includes a plurality of nozzle vanes (also referred to as "movable vanes") that are arranged in the exhaust gas flow path in a turbine housing, for example, and vary the flow path area of the exhaust gas flow path.
  • the actuator displaces (rotates) the nozzle vanes.
  • variable nozzle vane turbocharger may be provided with a stopper that limits the range of the movement of the nozzle vanes, that is, their position in the closed state and their position in the open state (see PTLs 1 and 2, for example).
  • variable nozzle vane turbocharger mounted to a vehicle, that prevents wear on structural members of the variable nozzle vane mechanism, such as a link or a rod, during an engine stop while the vehicle is running.
  • a control device of a turbocharger includes a turbine wheel provided in an exhaust path of an engine mounted to a vehicle; a compressor impeller provided in an intake path of the engine; a variable nozzle vane mechanism including a plurality of nozzle vanes provided on an outer circumferential side of the turbine wheel, the variable nozzle vane mechanism adjusting a flow of an exhaust gas with the plurality of nozzle vanes; and an actuator driving the nozzle vane mechanism.
  • the control device of the turbocharger has the technical feature that it continues an abutting control that causes a movable member (for example a driving link) of the variable nozzle vane mechanism to abut against a mechanical stopper as long as the engine is stopped while the vehicle is running.
  • that "the engine is stopped” while the vehicle is running includes not only the case that the engine speed is “0” (the pistons are stopped), but also the case that no gas flows from the combustion chambers of the engine to the exhaust system (the nozzle vanes), for example because the intake valve and the exhaust valve are both "closed", even though the pistons move in a state in which driving of the engine is stopped (state in which the fuel is cut).
  • a more specific example of the above-mentioned mechanical stopper is a stopper that limits the range of the movement of the nozzle vanes.
  • the movable member (for example a driving link) of the variable nozzle vane mechanism may abut against a fully-closed stopper that limits the position on the closed side of the nozzle vanes, or the movable member (for example the open/close arms) of the variable nozzle vane mechanism may abut against a fully-open stopper that limits the position on the open side of the nozzle vanes.
  • an example of a specific configuration of the present invention is one in which an actuator that drives the variable nozzle vane mechanism is a motor-type actuator including an electric motor, which continuously performs said abutting control by continuously causing a current to flow through the electric motor as long as the engine is stopped while the vehicle is running.
  • the movable member (for example, the driving link or the like) of the variable nozzle vane mechanism abuts with a predetermined load against the mechanical stopper (for example, a stopper limiting the range of the movement of the nozzle vanes)
  • the backlash (gap) of the sliding portions of the variable nozzle vane mechanism, such as the driving link and the rod is eliminated, and the link and the rod are constrained by the load (more specifically, by the driving force of the electric motor).
  • VN abutting control As long as the engine is stopped while the vehicle is running, it is possible to prevent for example the link and the rod of the variable nozzle vane mechanism from suffering wear during an engine stop while the vehicle is running.
  • an example of the period during which the abutting control of abutting against the stopper is continued while the vehicle is running is the period from the stopping of the engine in accordance with an engine stop request (for example, engine stop flag: ON) until there is an engine start request (for example, engine start flag: ON).
  • an engine stop request for example, engine stop flag: ON
  • an engine start request for example, engine start flag: ON
  • VN abutting control it is not necessary to drive the electric motor at full power during the above-described VN abutting control. That is to say, a motor power is sufficient, with which a load can be ensured at which the structural members of the variable nozzle vane mechanism, such as the link and the rod, can be sufficiently constrained.
  • the motor power during this VN abutting control is explained in the following.
  • An example of the current control of the electric motor may be a method in which the current flowing through the electric motor is limited such that a motor target power is attained that is smaller (for example about 50% of the full power) than the full power (the voltage of the power supplied from the car battery to the electric motor is substantially constant).
  • the abutting control of the variable nozzle vane mechanism is continued as long as the engine is stopped while the vehicle is running, so that it can be prevented that structural members of the variable nozzle vane mechanism, such as a link and a rod, suffer wear during an engine stop while the vehicle is running.
  • FIG. 1 is a schematic diagram illustrating an example of a hybrid vehicle to which the present invention is applied.
  • the hybrid vehicle HV of this example is of the FF (front engine, front-wheel drive) type, and includes an engine 1, a first motor generator MG1 functioning mainly as an electric generator, a second motor generator MG2 functioning mainly as an electric motor (motor), a power splitting mechanism 3, a reduction mechanism 4, a counter-drive gear 51, a counter-driven gear 52, a final ring gear 53, a differential device 54, drive wheels 6, and an ECU (Electronic Control Unit) 200.
  • FF front engine, front-wheel drive
  • the ECU 200 is constituted for example by a hybrid ECU, an engine ECU, a battery ECU and the like, and these ECUs are connected such that they can communicate with each other.
  • the engine 1 is a publicly known motor device that outputs a motive power by combusting fuel, such as a gasoline engine or a diesel engine, and is configured such that its operating state, for example the fuel injection amount and the throttle opening degree of a throttle valve 13 provided in an intake path 11 (intake air amount) can be controlled.
  • the rotation speed (engine speed) of a crankshaft 10 serving as the output shaft of the engine 1 is detected by an engine speed sensor 81.
  • the engine 1 of this example is equipped with a turbocharger 100 (see FIG. 2 ). The configuration of the turbocharger 100 is explained further below.
  • the throttle valve 13 is opened and closed by a throttle motor 14.
  • the opening degree of the throttle valve 13 is detected by a throttle opening degree sensor 83.
  • the output of the engine 1 is transmitted via the crankshaft 10 and a damper 2 to an input shaft 21.
  • the damper 2 is a coil spring-type transaxle damper, for example, and absorbs torque fluctuations of the engine 1. It should be noted that the other end of the input shaft 21 is coupled to an oil pump 22, which receives a rotation torque of the input shaft 21 to operate the oil pump 22.
  • the first motor generator MG1 is an AC synchronous electric generator including a rotor MG1R made of a permanent magnet supported rotatably with respect to the input shaft 21, and a stator MG1S with three-phase windings, and functions as an electric generator as well as an electric motor (motor).
  • the second motor generator MG2 is an AC synchronous electric generator including a rotor MG2R made of a permanent magnet supported rotatably with respect to the input shaft 21, and a stator MG2S with three-phase windings, and functions as an electric motor (motor) as well as an electric generator.
  • the first motor generator MG1 and the second motor generator MG2 are both connected via an inverter 300 to an HV battery (electric accumulator) 400.
  • the inverter 300 is controlled by an ECU 200, and the motor generators MG1 and MG2 are set to regeneration or drive (assist) by controlling this inverter 300.
  • the regeneration power is charged via the inverter 300 to the HV battery 400.
  • the driving power for the motor generators MG1 and MG2 is supplied from the HV battery 400 via the inverter 300.
  • the power splitting mechanism 3 is configured by a planetary gear train including a sun gear S3, pinion gears P3, a ring gear R3 and a planetary carrier CA3.
  • the sun gear S3 is an external gear that revolves around itself at the center of the plurality of gear elements.
  • the pinion gears P3 are external gears that revolve around themselves while orbiting around the sun gear S3 in contact with the same.
  • the ring gear R3 is an internal gear that has a hollow ring shape and meshes with the pinion gears P3.
  • the planetary carrier CA3 supports the pinion gears P3 and revolves around itself through the orbiting of the pinion gears P3.
  • the planetary carrier CA3 is coupled in a rotatably fixed manner to the input shaft 21 on the side of the engine 1.
  • the sun gear S3 is coupled to the rotor MG1R of the first motor generator MG1 so as to rotate integrally with the rotor MG1R.
  • This power splitting mechanism 3 transmits the driving power of at least one of the engine 1 and the second motor generator MG2 via the counter-drive gear 51, the counter-driven gear 52, the final ring gear 53, and the differential device 54 to the left and right drive wheels 6.
  • the reduction mechanism 4 is configured by a planetary gear train including a sun gear S4, pinion gears P4, and a ring gear R4.
  • the sun gear S4 is an external gear that revolves around itself at the center of a plurality of gear elements.
  • the pinion gears P4 are external gears that are rotatably supported by a carrier (transaxle case) CA4 and revolve around themselves while orbiting around the sun gear S4 in contact with the same.
  • the ring gear R4 is an internal gear that has a hollow ring shape and meshes with the pinion gears P4.
  • the ring gear R4 of the reduction mechanism 4, the ring gear R3 of the power splitting mechanism 3 and the counter-drive gear 51 are integrated with each other.
  • the sun gear S4 is coupled to the rotor MG2R of the second motor generator MG2 so as to rotate integrally with the rotor MG2R.
  • This reduction mechanism 4 reduces the driving power of at least one of the engine 1 and the second motor generator MG2 at a suitable reduction ratio.
  • the reduced driving power is transmitted via the counter-drive gear 51, the counter-driven gear 52, the final ring gear 53, and the differential device 54 to the drive wheels 6.
  • the turbocharger 100 of this example includes a turbine wheel 101 arranged in an exhaust path 12, a compressor impeller 102 arranged in an intake path 11, and a coupling shaft 103 unitarily coupling the turbine wheel 101 and the compressor impeller 102 into one.
  • the turbine wheel 101 arranged in the exhaust path 12 is rotated by the energy of the exhaust gas, and the compressor impeller 102 arranged in the intake path 11 follows this rotation.
  • the intake air is thus supercharged by the rotation of the compressor impeller 102, and the supercharged air is forced into the combustion chamber of each of the cylinders of the engine 1.
  • the turbine wheel 101 is accommodated inside a turbine housing 111
  • the compressor impeller 102 is accommodated inside a compressor housing 112.
  • floating bearings 104 supporting the coupling shaft 103 are accommodated inside a center housing 113, and the turbine housing 111 and the compressor housing 112 are attached to both sides of this center housing 113.
  • the turbocharger 100 of this example is a variable nozzle turbocharger (VNT), and is provided with a variable nozzle vane mechanism 120 on the side of the turbine wheel 101.
  • VNT opening degree By adjusting the opening degree of this variable nozzle vane mechanism 120 (VN opening degree), it is possible to adjust the supercharging pressure of the engine 1.
  • the variable nozzle vane mechanism 120 is explained with reference to FIGS. 2 to 7 .
  • variable nozzle vane mechanism 120 is arranged in a link chamber 114 formed between the turbine housing 111 and the center housing 113 of the turbocharger 100.
  • the variable nozzle vane mechanism 120 includes an annular unison ring 122, a plurality of open/close arms 123 ... 123 that are positioned on the inner side of the unison ring 122, a portion of the open/close arms 123 engaging the unison ring 122, a main arm 124 for driving the open/close arms 123, vane shafts 125 that are coupled to the individual open/close arms 123, for driving the nozzle vanes 121, and a nozzle plate 126 holding the vane shafts 125.
  • the variable nozzle vane mechanism 120 is a mechanism for adjusting the turning angle (turning attitude) of the plurality of (e.g. twelve) nozzle vanes 121 ... 121, which are arranged at equal intervals.
  • the plurality nozzle vanes 121 ... 121 are arranged on the outer circumferential side of the turbine wheel 101.
  • the nozzle vanes 121 are arranged on the nozzle plate 126, and can be turned by a predetermined angle around the vane shafts 125.
  • the variable nozzle vane mechanism 120 transmits this turning force via the main arm 124, the unison ring 122, and the open/close arms 123 to the nozzle vanes 121, thus turning the nozzle vanes 121.
  • the driving link 127 can be turned around a driving shaft 128.
  • the driving shaft 128 is coupled to the driving link 127 and the main arm 124 such that they turn together.
  • this turning force is transmitted to the main arm 124.
  • the end on the inner circumferential side of the main arm 124 is fixed to the driving shaft 128.
  • the end on the outer circumferential side of the main arm 124 engages the unison ring 122, and when the main arm 124 is turned around the driving shaft 128, then this turning force is transmitted to the unison ring 122.
  • the ends on the outer circumferential side of the open/close arms 123 are fitted to the inner circumferential surface of the unison ring 122, and when the unison ring 122 is turned, then this turning force is transmitted to the open/close arms 123. More specifically, the unison ring 122 is arranged to be slidable in circumferential direction with respect to the nozzle plate 126. The ends on the outer circumferential side of the main arm 124 and the open/close arms 123 are fitted to a plurality of recesses 122a that are arranged at the inner circumferential edge of the unison ring 122, and the rotation force of the unison ring 122 is transmitted to the open/close arms 123.
  • the nozzle plate 126 is fixed to the turbine housing 111.
  • Pins 126a (see FIGS. 4 and 6 ) are inserted into the nozzle plate 126, and rollers 126b are fitted to the pins 126a.
  • the rollers 126b guide the inner circumferential surface of the unison ring 122.
  • the unison ring 122 is held by the rollers 126b and can be turned in a predetermined direction.
  • the open/close arms 123 can turn around the vane shafts 125.
  • the vane shafts 125 are supported rotatably by the nozzle plate 126, and the open/close arms 123 and the nozzle vanes 121 are coupled by the vane shafts 125 such that they can turn together.
  • this turning movement is transmitted to the vane shafts .125.
  • the nozzle vanes 121 turn together with the vane shafts 125 and the open/close arms 123.
  • the turbine housing 111 in which the turbine wheel 101 is accommodated is provided with a turbine housing vortex chamber 111a.
  • the exhaust gas is supplied to this turbine housing vortex chamber 111a, and the turbine wheel 101 is rotated by the stream of the exhaust gas.
  • by adjusting the turning positions of the nozzle vanes 121 as described above and setting the turning angles of the nozzle vanes 121 it is possible to adjust the flow amount and the flow speed of the exhaust from the turbine housing vortex chamber 111a to the turbine wheel 101.
  • the driving link 127 of the variable nozzle vane mechanism 120 is connected to a rod 129.
  • This rod 129 is a rod-shaped member, which is coupled to a VN actuator 140.
  • the VN actuator 140 includes an electric motor (DC motor) 141 and a conversion mechanism that converts a rotation of this electric motor 141 into a linear motion and transmits it to the rod 129 (for example, a gear mechanism having a worm gear and a worm wheel meshing with this worm gear; not shown in the drawings).
  • the VN actuator 140 is drive-controlled by a VN controller 150.
  • the VN controller 150 controls the current flowing through the electric motor 141 of the VN actuator 140.
  • An output signal of a nozzle position sensor 142 that detects the position (opening degree) of the nozzle vanes 121 is input into the VN controller 150.
  • the VN controller 150 is further provided with a current detection sensor 151 that detects the current value of the electric motor 141. It should be noted that the power from an auxiliary battery 500 is supplied to the electric motor 141.
  • the VN controller 150 controls the current of (rotationally drives) the electric motor 141 of the VN actuator 140, the rotation force of the electric motor 141 is transmitted via the above-described rotation mechanism to the rod 129, and the driving link 127 turns in accordance with the movement (advancing/retreating movement) of the rod 129, so that the nozzle vane 121 is turned (displaced).
  • the unison ring 122 is turned in the direction of the arrow Y1 in FIG. 4 , and as shown in FIG. 5 , the nozzle vanes 121 are turned in counterclockwise direction (direction Y1) in FIG. 5 around the vane shafts 125, so that the nozzle vane opening degree (VN opening degree) is set to be larger.
  • variable nozzle vane mechanism 120 of this example the range of the movement (open/closed range) of the nozzle vanes 121 is regulated by a fully-closed stopper 131 and fully-open stoppers 132.
  • the fully-closed stopper 131 is arranged at a position opposite to the driving link 127, and the position on the closed side of the nozzle vanes 121 (fully-closed position) is limited by letting the driving link 127 abut against the fully-closed stopper 131.
  • the fully-open stoppers 132 are provided at three (rotationally symmetric) locations of the circularly ring-shaped nozzle plate 126.
  • the fully-open stoppers 132 are positioned between neighboring open/close arms 123.
  • the position on the open side (fully open position) of the nozzle vanes 121 is limited by letting these open/close arms 123 abut against the corresponding fully-open stoppers 132 when the nozzle vanes 121 are turned (displaced) maximally to the open side.
  • the VN opening degree is controlled by adjusting the opening degree command value in response to the engine operating state within a range of 0% ... 100% (where 100% corresponds to the control to the fully closed position).
  • the ECU 200 is an electronic control device that controls the engine 1 and the two motor generators MG1 and MG2 in coordination, and includes a CPU (central processing unit), a ROM (read-only memory), a RAM (random access memory) and a backup RAM, for example.
  • the ROM stores various kinds of control programs as well as maps or the like that are looked up when executing these control programs.
  • the CPU executes computation processing based on the control programs and the maps stored in the ROM.
  • the RAM is a memory that temporarily stores computation results of the CPU as well as data or the like that it input from the sensors.
  • the backup RAM is a non-volatile memory that stores data to be held, for example when the engine 1 is stopped.
  • the ECU 200 is connected to an engine speed sensor 81 that detects the rotation speed (engine speed, rpm) of the crankshaft 10 serving as the output shaft of the engine 1, an accelerator opening degree sensor 82 that detects how much the accelerator pedal is pressed down (accelerator opening degree), a throttle opening degree sensor 83, an air flow meter 84 that detects the amount of air taken in (intake air amount), an intake temperature sensor 85 that detects the temperature of the intake air, a water temperature sensor 86 that detects the temperature of the cooling water of the engine 1 (cooling water temperature), and a vehicle speed sensor 8'7 that detects the speed of the vehicle. Signals from these sensors are input into the ECU 200.
  • the ECU 200 is connected to, for example, a throttle motor 14 that opens and closes the throttle valve 13 of the engine 1, a fuel injection device 15, and a VN controller 150 (VN actuator 140).
  • the ECU 200 controls various aspects of the engine 1, such as the throttle opening degree (intake air amount) and the fuel injection amount of the engine 1. Furthermore, the ECU 200 carries out the "VN control" explained below.
  • the ECU 200 calculates the state of charge (SOC) of the HV battery 400, the input limit Win and the output limit Wout of the HV battery 400, based on the accumulated charge/discharge current detected by a current sensor (not shown) for the HV battery, the battery temperature detected by a battery temperature sensor, and the like.
  • SOC state of charge
  • the inverter 300 is connected to the ECU 200.
  • the inverter 300 converts the DC current from the HV battery 400 for example in response to a command signal from the ECU 200 into a current for driving the motor generators MG1 and MG2, and on the other hand converts the AC current generated with the first motor generator MG1 from the motive power of the engine 1 as well as the AC current generated with the second motor generator MG2 by regenerative braking into a DC current for charging the HV battery 400.
  • the inverter 300 supplies the AC current generated by the first motor generator MG1 as the driving power of the second motor generator MG2.
  • an intermittent operation is carried out, in which the engine 1 automatically stops and starts when predetermined conditions are met.
  • the cooling water temperature of the engine 1 is at least a predetermined temperature (for example 55°C to 65°C)
  • the state of charge SOC of the HV battery 400 is within a predetermined control range
  • the requested power (drive wheel output) corresponding to the amount by which the accelerator pedal is pressed down is not greater than a predetermined value (for example 2 kW to 10 kW)
  • the ECU 200 determines that the engine stop conditions are met (engine stop flag: ON).
  • engine stop conditions are met, then a transition is made to motor running by stopping the fuel supply to the engine 1 (cutting the fuel) and thus stopping the engine 1.
  • the ECU 200 judges that the engine start conditions are met (engine start flag: ON). When the engine start conditions are met, fuel is no longer cut (fuel supply to the engine 1 is started), and the engine 1 is started by cranking it with the first motor generator MG1.
  • VN control variable nozzle vane mechanism 120
  • the VN opening degree during an engine stop is set by the control to the fully closed position (opening degree command value: 100%). Moreover, the driving link 127 (nozzle vanes 121) abuts against the fully-closed stopper 131 during the engine stop when carrying out the above-described fully-closed position learning, but in any case, the current flow through the electric motor 141 of the VN actuator 140 is stopped at the time when the processing stops, and after stopping the engine, no current flows through the electric motor 141 anymore.
  • the fuel is cut and the engine 1 is stopped, making a transition to motor running, but when running while the engine is stopped, for example the driving link 127 and the rod 129, which are structural members of the variable nozzle vane mechanism 120, may be subject to wear due to vibrations while the vehicle is running. That is to say, in the conventional control, as noted above, no current flows through the electric motor 141 after the engine has been stopped, so that a state is assumed in which no load acts on such members as the driving link 127 and the rod 129 (unconstrained state).
  • variable nozzle vane mechanism 120 when vibrations (such as running vibrations) are applied from outside to the variable nozzle vane mechanism 120, then the driving link 127 and the rod 129 slide easily (their backlash portions slide) on the components fitted to them, so that wear may occur. When this wear advances, there is the risk that a malfunction occurs in the supercharging pressure control.
  • variable nozzle vane mechanism 120 such as the driving link 127 and the rod 129, are in a state in which they can slide, but during the engine operation, exhaust gas flows toward the nozzle vanes 121, and the driving link 127 and the rod 129 are constrained by the air pressure of this exhaust gas, that is, the load acting on the nozzle vanes 121, so that the problem of abrasive wear does not occur.
  • VN control The specific control (VN control) for this is explained with reference to the flowchart in FIG. 9 .
  • the flowchart in FIG. 9 is executed by the ECU 200.
  • Step ST101 it is judged whether "engine stop flag: ON” is given while the vehicle is running. If the result of this judgment is negative (NO), then the procedure returns. If the result of the judgment in Step ST101 is positive (YES) (that is, "engine stop flag: ON while the vehicle is running), then, the fuel is cut and the engine 1 is stopped, as described above. Note that the judgment whether the vehicle is running is performed based on the output signal of the vehicle speed sensor 87.
  • Step 102 it is judged in Step 102 whether the engine 1 is stopped or not. More specifically, at the time when the engine speed calculated from the output signal of the engine speed sensor 81 becomes "0", it is judged that the engine is stopped. It should be noted that the judgment whether the engine is stopped or not may also be performed, by judging in a state in which for example the engine speed is close to "0" that "the engine is stopped” when the engine speed (detection value) is smaller than a value (engine speed) at which no increase in the rotation speed of the turbocharger 100 occurs, even when the driving link 127 (nozzle vanes 121) abuts against the fully-closed stopper 131 (VN abutting).
  • Step ST102 When the judgement result in Step ST102 becomes positive (YES), current is caused to flow through the electric motor 141 of the VN controller 150 in Step ST103 (this current control is explained later), and the nozzle vanes 121 are displaced (turned) to the closed side, so that the driving link 127 (nozzle vanes 121) abuts against the fully-closed stopper 131 (VN abutting control).
  • Step ST103 This VN abutting control in Step ST103 is carried out continuously until the engine start flag is turned ON, and at the time when "engine start flag: ON", that is, when the judgment result in Step ST104 becomes positive (YES), an opening-side current is caused to flow through the electric motor 141 (a current flowing in the opposite direction than in the VN abutting control), controlling the nozzle vanes 121 to be opened to the fully closed position (Step ST105).
  • the fuel is no longer cut (the fuel supply to the engine 1 is started), and the engine 1 is started by cranking it with the first motor generator MG1 to perform normal control (Steps ST106 ... ST107). More specifically, in accordance with the engine operation state, the VN opening degree is controlled by adjusting the opening degree command value within a range of 0% ... 100% (where 100% corresponds to the control to the fully closed position).
  • the driving link 127 (nozzle vanes 121) abuts against the fully-closed stopper 131, so that the backlash (gap) of the sliding portions of the variable nozzle vane mechanism 120, such as the driving link 127 and the rod 129, is eliminated, and the driving link 127 and the rod 129 are constrained by the driving force of the electric motor 141. That is to say, by performing the abutting control of abutting against the stopper, it is possible to prevent the driving link 127 and the rod 129 from sliding on components fitted to them, even when vibrations during the running of the vehicle act on the variable nozzle vane mechanism 120.
  • variable nozzle vane mechanism 120 By continuing this VN abutting control as long as the engine 1 is stopped while the vehicle is running, it is possible to prevent structural members of the variable nozzle vane mechanism 120, such as the driving link 127 and the rod 129, from suffering wear while the engine is stopped during the running of the vehicle.
  • the electric motor 141 does not need to be driven at full power. That is to say, a motor power is sufficient, with which it can be ensured that the structural members of the variable nozzle vane mechanism 120, such as the driving link 127 and the rod 129, are sufficiently constrained.
  • the motor power during this VN abutting control is explained in the following.
  • An example of the current control of the electric motor 141 is a method in which, based on the output signal of the current detection sensor 151 with which the VN controller 150 is provided, the current flowing through the electric motor 141 is limited such that a motor target power is attained that is smaller (for example about 50% of the full power) than the full power (the voltage of the power supplied from the auxiliary battery 500 to the electric motor 141 is substantially constant). Then, by controlling the motor power in this way, the power that is consumed while the VN abutting control continues can be reduced. Moreover, it can be avoided that the motor load becomes excessive, and also a reduction of the lifetime of the electric motor 141 can be suppressed.
  • an abutting control (VN abutting control) is carried out that lets the driving link 127 (nozzle vanes 121) abut against the fully-closed stopper 131, but instead, it is also possible to constrain the structural members of the variable nozzle vane mechanism 120, such as the driving link 127 and the rod 129, with the motor load by continuing the control of letting the open/close arms 123 (nozzle vanes 121) abut against the fully-open stoppers 132 during an engine stop while the vehicle is running.
  • transaxle of the hybrid vehicle is not limited to the embodiment shown in FIG. 1 , and the present invention can also be applied to control (VN control) of a turbocharger in a hybrid vehicle equipped with a transaxle of another suitable embodiment, such as a transaxle provided with a gearing function, by which gearing is performed through engagement /disengagement of frictionally engaged elements.
  • VN control VN control
  • the present invention is applied to the control of a hybrid vehicle equipped with two electric motors, namely a first motor generator and a second motor generator, but the present invention can also be applied to the control (VN control) of a turbocharger in a hybrid vehicle equipped with one electric motor or three or more electric motors.
  • the present invention can be utilized in a control device of a turbocharger mounted to a hybrid vehicle or the like, and more specifically, can be utilized advantageously in a control device of a variable nozzle vane turbocharger.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Supercharger (AREA)
EP10846812.5A 2010-11-12 2010-11-12 Steuervorrichtung für einen turbolader Not-in-force EP2474724B1 (de)

Applications Claiming Priority (1)

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PCT/JP2010/070200 WO2012063359A1 (ja) 2010-11-12 2010-11-12 ターボチャージャの制御装置

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JPWO2012063359A1 (ja) 2014-05-12
US20120121392A1 (en) 2012-05-17
JP5035473B2 (ja) 2012-09-26
EP2474724A4 (de) 2014-05-07
EP2474724B1 (de) 2018-07-18
US8683799B2 (en) 2014-04-01
WO2012063359A1 (ja) 2012-05-18
CN103221657B (zh) 2015-07-08
CN103221657A (zh) 2013-07-24

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